Fair Value Measurements - Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financial Assets
Trading securities held in deferred compensation plan	$ 15.0	$ 12.3
Interest rate swaps	16.9	14.1
Interest rate caps		18.1
Cross-currency interest rate swaps	16.7	17.7
Foreign currency forwards	0.0	0.0
Total	48.6	62.2
Financial Liabilities
Deferred compensation plans	21.5	19.6
Cross-currency interest rate swaps	19.5	28.7
Contingent consideration	42.3	43.9
Foreign currency forwards		0.0
Total	83.3	92.2
Level 1
Financial Assets
Trading securities held in deferred compensation plan	15.0	12.3
Interest rate swaps	0.0	0.0
Interest rate caps		0.0
Cross-currency interest rate swaps	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	15.0	12.3
Financial Liabilities
Deferred compensation plans	21.5	19.6
Cross-currency interest rate swaps	0.0	0.0
Contingent consideration	0.0	0.0
Foreign currency forwards		0.0
Total	21.5	19.6
Level 2
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate swaps	16.9	14.1
Interest rate caps		18.1
Cross-currency interest rate swaps	16.7	17.7
Foreign currency forwards	0.0	0.0
Total	33.6	49.9
Financial Liabilities
Deferred compensation plans	0.0	0.0
Cross-currency interest rate swaps	19.5	28.7
Contingent consideration	0.0	0.0
Foreign currency forwards		0.0
Total	19.5	28.7
Level 3
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate swaps	0.0	0.0
Interest rate caps		0.0
Cross-currency interest rate swaps	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	0.0	0.0
Financial Liabilities
Deferred compensation plans	0.0	0.0
Cross-currency interest rate swaps	0.0	0.0
Contingent consideration	42.3	43.9
Foreign currency forwards		0.0
Total	$ 42.3	$ 43.9